Pump



Oct. 13, 1964 v. G. PETERS 3,152,551-

PUMP

Fled Jan. 25, 1965 'United States Patent O M' Iowa Filed Jan. 25, 1963, Ser. No. 253,951 6 Claims. (Cl. 103-126) This invention relates to a pump and, more particularly, to a pump assembly including an independent casing unit mounting a contnolled temperature pump unit, land .to features thereof.

It is the principal object of the invention to provide a new and useful pump assembly, and more particularly such an assembly having separate casing and pump units. A related object is provision of such a pump assembly wherein the casing and pump units are of diierent materials. Another related object is provision in such a pump assembly for controlling the temp-triature of the pump unit.

Other objects and advantages of the invention will become apparent from the following description and the accompanying drawings as follows:

FIGURE 1 is a perspective view of .a preferred embodiment of the invention in the form of a pump assembly, with parts broken away for clearer illustration;

FIGURE 2 is an enlarged, vertical sectional View extending longitudinally of the pump assembly shown in FGURE l; and

FIGURE 3 is a vertical, end section taken generally along the line 3-3 in FIGURE 2.

Various types of pumps are commercially available for special uses, for example in handling liquid food products. Such uses require that at least the liquid contacting portions lof the pump be of a `suitable material compatible with the product being handled. A suitable pump for such use is shown in United States Patent No. 3,015,282, granted lanuary 2, 1962, wherein a rotary gear pump is illustrated. While numerous expedients are well known in the art for pumping food products, the cost of many suitable pumps is extremely high, and often they are constructed in such a manner that servicing is d-iflicul-t. Another problem is provision of a practical construction for regulating the temperature of liquids passing through a pump while providing a pump which is economically feasible in manufacture and service costs.

The invention, is in brief, directed to a pump assembly including a pump unit which may be conveniently manufactured of any desired material which is particularly suited for use with the iiuid being pumped. The construction is such that the pump unit may be mounted in a durable and relatively inexpensive casing of another material particularly suited for such use, `and the mounting is of a nature'to facilitate manufacture and reduce the cost thereof while providing for easy servicing. In conjunction therewith means is provided for regulating tempenature of fluid being pumped. The pump assembly as illustrated includes la casing unit having means in the form of a llange 12 for mounting the pump assembly on a suitable support. The pump assembly further includes a pump unit 14 including a pump drive shaft 16 and this unit is rele-asably held in the casing unit 10 by suitable holding means illustrated in the form of bolts 18. Temperature controlling means in the form of chambers 2t) and 22 is provided for controlling the temperature of uid being pumped.

More particularly, the casing unit 10 may be suitably attaehed to a support (not shown) by means fof the mounting flange 12 having holes 24 for receiving bolts. rl`he casing unit 10 further includes a hollow portion defined by a generally cylindrical side wall 264 opening 3,152,55l Patented 0st. 13, 1964 ICC through opposite ends of the casing. More particularly, one end of the casing is defined by a transverse shoulder 28 generally normal to Ithe longitudinal axis of the hollow, and the opposite end is provided with an inwardly extending ange 3th having a generally cylindrical inner peripheral surface defining a seat 32 and a radially extending shoulder 34 generally normal lto the longitudinal axis of the hollow. Suitable arms 36 extend forwardly from the last mentioned end of the casing 1t) and along with an arm 38 extending upwardly from the mounting iiange 12 support a bearing mount 44), illustrated in the form of a split clamping ring having `a tightening bolt 42.

The pump unit 14 includes a body 44 of a material particularly suited for contact with the fluid being pumped and is preferably of stainless steel but may be of other types of steel, nickel, Monel, nodular iron, Ni-resist cop. free, white, silicon or aluminum bronzes, or other materials as preferred for the intended use of the pump.

The pump unit 14 further includes a pumping chamber 46 defined by a cylindrical side wall 48 land opposed end walls 5t? and 52. The end wall 52 is in the form of a cover plate 52 which is separate from the pump body 44 but preferably formed of the same material as the pump body and is suitably secured thereto as by a plurality of bolts S4 extending through a radial ange 56 of the end wall 52 and seated in threaded apertures in the body 44. An internal pump gear or rotor 60 is secured to an inner end of the drive shaft 16 for rotation within the pumping chamber 46 and has axially extending peripheral projections 62 formed as internal gear teeth which cooperate with the teeth of an idler gear 64 mounted on a shaft 66 which is suitably seated in the cover plate 52 eccentrically of the longitudinal .axis of the drive shaft 16 for rotation responsive to rotation of the rotor 6i?. A crescent-shaped projection 68 is formed integrally with the cover plate 52 and extends into the pump chamber 44 in the space between the two gears. Such pump unit construction is more thoroughly discussed in the aforementioned patent and reference may be had thereto should a fuller discussion of this portion of the pump assembly be. desired.

Means operatively seating the pump unit 14 on the casing unit 12 includes the pump chamber end wlall 50 which extends radially outwardly from the pump chamber side wall 43 and is provided with a radially extending shoulder 70 generally normal to the longitudinal axis of the drive shaft 16 and seated against a cooperating portion of the casing unit rand more particularly the casing end shoulder 28. A boss in the form of a sleeve 72 extends from the pumping chamber wall 50 axially about the drive shaft 16 `and has a free end provided with a suitable bearing and packing assembly 74 providing -a journal for the drive shaft and prevent-ing escape along the drive shaft of huid being pumped. The free end of the sleeve has a cylindrical portion 76 telescoped into and snugly seated on the cylindrical seat 32 of the casing unit 1d. A radial shoulder 77 is smaller than the side wall 26 of the hollow and extends outwardly in a direction generally normal to the longitudinal axis of the sleeve and is seated against the radial shoulder 34 of the casing unit 10 with ia suitable packing 7'7 therebetween. A cylindrical portion 78 of the sleeve at the end wall 40 is seated in a suitable cylindrical recess 79 in the casing unit 'adjacent its end shoulder 28. lThus, the sleeve 72 is telesooped into the casing unit 1i) and is operatively seated therein.

Holding means, inthe form of the bolts 18, is provided for releasably and openative-ly iixedly securing the pump unit on the casing unit 10 and herein these bolts extend through openings in the end of the casing unit adjacent the pumping chamber and are seated in threaded openings in the pumping chamber end wall 50.

The drive shaft 16 extends outwardly from the free end of the sleeve '72 and through a suitable bearing assembly Sil. The bearing assembly is illustrated in the form of a bearing housing 82 having a stepped outer periphery seated in a cooperating stepped opening in the casing unit bearing mount 40 and is releasably retained therein by tightening the bolt 42. A caged ball bearing unit S4 is seated in the bearing housing 82 and telescopically receives a stepped portion of the drive shaft thereby providing an end journal for the shaft. A nut Se is threaded on an outer portion of the drive shaft and is seated against an outer end of a sleeve 8S which has an inner end seated against the ball bearing unit 84 to hold the drive shaft 16 operatively assembled. A reduced outer end t) of the drive shaft is provided for receiving a drive belt pulley or gear for providing power to operate the pump.

Upon rotation of the drive shaft 16 the rotor 60 and the idle gear 64 are driven to pump fluid from an inlet 92 in the pump chamber side wall 43, through the pumping chamber 4-5 and out an outlet M also in the pumping chamber side wall 4S. It should be noted that the pump chamber side wall 4S is exposed to ambient air about the pump assembly and that the inlet 92 and the outlet 94 are easily accessible for connecting or disconnecting suitable piping.

In order to regulate the temperature of Huid passing through the pump unit the temperature control means is provided. As previously mentioned, this means includes the chamber 2t) located about the sleeve 72 and defined by an outer peripheral wall 96 of the sleeve and the cylindrical inner wall Z6 of the casing unit hollow between the cooperating seated portions of the sleeve and casing unit, and more particularly between the pump unit end wall 50 and the cooperating shoulders 34 and 77 on the casing unit and the free end of the sleeve, respectively. A packing unit 98 is provided between the pump end wall Sil and the casing unit and along with the packing 77 retains cooling medium within the chamber Ztl. It should be noted that the use of dissimilar materials may create problems as the pump assembly heats or cools during operation. The present construction is adapted to compensate for such differences in expansion or contraction of the dissimilar parts and to this end the packings 77 and 9S are preferably asbestos gaskets. These packings further provide means maintaining tight seal during expansion and contraction of the casing unit it) and the pumping unit 14 as will be more fully described hereinafter. The temperature control means further includes the previously mentioned chamber 22 along the cover plate 52. This chamber is defined by the outer surface of the cover plate and an adjacent inner surface of a generally cup-shaped end member lttl secured in iuid tight manner on the cover plate 46 by means of the bolts 54, as may best be seen in FIGURE 2. Inlet and outlet means is provided for the passage of suitable cooling medium, such as water, through the chambers 2@ and 22, and herein the chamber 2G' is provided with an inlet 1&2 and an outlet 1% in the casing unit 1%, and the chamber 22 is provided with an inlet 1% and an outlet M8 in the end member lill).

The foregoing expedients facilitate the pump unit 14 being constructed of a metal particularly suited for contact with the fluid being pumped, and in a food handling pump this is particularly important. Most materials which are suitable for such use are also relatively expensive, and many do not provide adequate structural strength for optimum durability. The construction illustrated and described facilitates the use of a casing unit 10 of a material entirely dissimilar to the material utilized in the pumping unit 14. Cast iron has for many years been a standard machine material where high strength and durability are required and has been found to be eminently suited for use in the present environment. The machining qualities of iron provide an additional advantage in the present construction since the casing unit 1G and the pump unit body i4 may each have their cooperating inter-fitting parts machined in a single lathe set-up. More particularly, with reference to the casing unit 10, the stepped portion of the mounting 40, the shoulders 2S and 34, and the cylindrical seats 32 and 73 may be machined in a simple manner with the casing unit mounted in a lathe. Similarly, the pumping chamber 46 and the portions of the sleeve 72 seated against the casing unit 19 along with the portion of the sleeve which receives the bearing and packing assembly 74 may be machined in a single lathe set-up. This construction thus provides for a reduction in manufacturing costs and facilitates accuracy in machining critical portions of the pump assembly. lt should further be noted that the pumping unit 14 may be easily removed from or installed in the casing unit l@ by merely removing the bolts 18 along with the nut 86 whereupon the pumping unit 14 is merely telescoped outwardly of the casing unit l).

While this invention has been described with reference to certain structure and materials in a particular environment, various changes may be apparent to one skilled in the art and the invention therefore is not to be limited to such structure, materials or environment. Features of the invention believed new and patentable are set forth in the appended claims.

What is claimed is:

1. A pump assembly comprising, a pump unit of a material particularly suited for contact with a tiuid to be pumped, said pump unit having a pumping chamber dened by opposite end walls, a sleeve integral with and extending from one of said end walls and having a free end spaced from the last said end wall, and a pump drive shaft extending through said sleeve and outwardly from said free end, a casing unit of a material other than the pump unit material and including opposite ends and a hollow portion opening through said ends, said hollow portion telescopically receiving said sleeve, means operatively fixedly mounting said pump unit on said casing unit and including opposite ends of said sleeve having portions snugly telescoped into cooperating portions of said casing unit with said one end wall of said pump unit seated against one of the casing unit ends and a shoulder extending radially of the sleeve free end and seated against a cooperating shoulder on said casing unit, a temperature control chamber about said sleeve and dened by spaced apart adjacent surfaces of said sleeve and casing unit between said cooperating shoulders and said one end wall, sealing means for retaining fluid in the last said chamber and compensating for differences in thermal expansion or contraction of said units.

2. The pump assembly of claim 1 wherein the pump unit material is stainless steel.

3. The pump assembly of claim 1 wherein the casing unit material is cast iron.

4. The pump assembly of claim 1 wherein the pump unit material is stainless steel and the casing unit material is cast iron.

5. A pump assembly comprising, a pump unit having a pumping chamber defined by opposite end walls, a sleeve integral with and extending from one of said end walls and having a free end spaced from the last said end wall, and a pump drive shaft extending outwardly from said free end, a casing unit including means for detachably and operatively fixedly mounting the pump assembly on a support, said casing unit having opposite ends and a hollow portion opening through said ends, means detachably and operatively mounting said pump unit on said casing unit and including opposite ends of said sleeve having portions snugly telescoped into cooperating portions of said casing unit within said hollow with said one end wall of said pump unit seated against one of the casing ends and a shoulder extending radially of the sleeve free end and seated against a cooperating shoulder on said casing unit, holding means detachably and operatively lixedly securing said pump unit on said casing, and temperature control means including chambers, a first of said chambers about said sleeve for regulating the temperature of said one end Wall and defined by spaced apart adjacent surfaces of said sleeve and casing unit between said cooperating shoulders and said one end Wall, and another of said kchambers along the other end wall of said pump unit for regulating the temperature of said other end wall and deiined by an end member along said other end Wall and having a surface spaced yfrom and adjacent an outer sur- Iface of said other end Wall, and sealing means at said c0- operating shoulders and at said casing one end and pump unit one end wall for retaining said temperature control medium in the lirst chamber.

6. A pump `assembly comprising, a pump unit having a body of a tirst material and said body including a pumping chamber defined -by opposite end walls and therebetween a side Wall having inlet and outlet means for said fluid, and a sleeve integral with and extending from one of said end walls and having a free end spaced from the last said end wall, a pump drive shaft extending through said sleeve and outwardly from said free end, a casing unit of material other than said iirst material and including means for detachably and operatively ixedly mounting the pump assembly on a support, said casing unit having opposite ends and a hollow portion opening through said ends, means operatively mounting said pump unit on said casing unit with said side wall disposed outwardly of said casing unit and including opposite ends of said sleeve having portions snugly telescoped into cooperating portions Within the casing hollow with said one end wall of said pump unit seated against one of the casing ends, and a shoulder extending radially of the sleeve `free end and seated against a cooperating shoulder on said casing unit, holding means connected with the casing unit one end and the pump unit one end Wall `and detachably and operatively iixedly securing said pump unit to said casing unit, and temperature control means including temperature control medium chambers, a first of said chambers about said sleeve and defined by spaced apart adjacent surfaces of said sleeve and casing unit between lsaid cooperating shoulders and said one end wall, and another of `said chambers along the other end Wall of said pump unit and deiined by an end member along said other end wall and having a surface spaced from and adjacent an outer surface of said other end wall, sealing means at said cooperating shoulders and at said easing unit one end and pump unit one end wall for retaining said temperature control medium in the iirst chamber and compensating `for differences in `thermal expansion or contraction of said units, and means for Iproviding temperature control medium in the last said chambers.

References Cited in the file of this patent UNITED STATES PATENTS 2,044,893 Wilhelm et al. June 23, 1936 2,120,914 Vogel June 14, 1938 2,766,695 Gailloud Oct. 16, 1956 2,810,348 White Oct. 22, 1957 2,825,286 White Mar. 4, 1958 2,912,937 Insley Nov. 17, 1959 2,925,041 Sigmund Feb. 16, 1960 2,994,795 Cattabiani Aug. l, 1961 FOREIGN PATENTS 591,835 Great Britain Aug. 29, 1948 1,049,446 France Aug. 19, 1953 1,152,344 France Sept. 2, 1957 

1. A PUMP ASSEMBLY COMPRISING, A PUMP UNIT OF A MATERIAL PARTICULARLY SUITED FOR CONTACT WITH A FLUID TO BE PUMPED, SAID PUMP UNIT HAVING A PUMPING CHAMBER DEFINED BY OPPOSITE END WALLS, A SLEEVE INTEGRAL WITH AND EXTENDING FROM ONE OF SAID END WALLS AND HAVING A FREE END SPACED FROM THE LAST SAID END WALL, AND A PUMP DRIVE SHAFT EXTENDING THROUGH SAID SLEEVE AND OUTWARDLY FROM SAID FREE END, A CASING UNIT OF A MATERIAL OTHER THAN THE PUMP UNIT MATERIAL AND INCLUDING OPPOSITE ENDS AND A HOLLOW PORTION OPENING THROUGH SAID ENDS, SAID HOLLOW PORTION TELESCOPICALLY RECEIVING SAID SLEEVE, MEANS OPERATIVELY FIXEDLY MOUNTING SAID PUMP UNIT ON SAID CASING UNIT AND INCLUDING OPPOSITE ENDS OF SAID SLEEVE HAVING PORTIONS SNUGLY TELESCOPED INTO COOPERATING PORTIONS OF SAID CASING UNIT WITH SAID ONE END WALL OF SAID PUMP UNIT SEATED AGAINST ONE OF THE CASING UNIT ENDS AND A SHOULDER EXTENDING RADIALLY OF THE SLEEVE FREE END AND SEATED AGAINST A COOPERATING SHOULDER ON SAID CASING UNIT, A TEMPERATURE CONTROL CHAMBER ABOUT SAID SLEEVE AND DEFINED BY SPACED APART ADJACENT SURFACES OF SAID SLEEVE AND CASING UNIT BETWEEN SAID COOPERATING SHOULDERS AND SAID ONE END WALL, SEALING MEANS FOR RETAINING FLUID IN THE LAST SAID CHAMBER AND COMPENSATING FOR DIFFERENCES IN THERMAL EXPANSION OR CONTRACTION OF SAID UNITS. 